Sounds like you lack a cam cleat for some reason. A cam cleat can typically be added to a double/triple block. What you need is a Harken H150 cam cleat with a H137 eyestrap and the mounting plate (? part number). (Ronstan et. al. make equivelent gear).

Believe the bottom block on a H14 is a 2.25" triple. Class legal max. is 5:1. The setup looks like this:

Harken bottom block w/ cam cleat

The Cat Sailor on-line store has this. Their help line is 1-866-451-3287.

Also, West Marine, or any marine store that caters to sailboats, stocks cam cleats. It may be easier to bring your existing block to the store to fit up the gear you need.

I am very happy with 5/16" Yale Light as my main sheet (36 LF for H14). The Cat Sailor store has a similar product:

Spectra-Lite

Ask more questions if you need more help and a picture is always a good reference.